The Jewish calendar differs from the common one. It is based on the revolutions of the moon around the earth, whereas the common calendar is based on the earth’s rotation around the sun. The lunar calendar comprises (in a normal year) twelve months each of 29 or 30 days. In a leap year a thirteenth month is added, known as Adar II.
A leap year occurs seven times in each cycle of nineteen years; in the third, sixth, eighth, eleventh, fourteenth, seventeenth and nineteenth years. By adding the extra month, the lunar year (354 days) is made to harmonize with the solar year (365 days).
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